Furnace construction



H. B. HOLT.

FURNACE CONSTRUCTION.

APPLlCATlON FILED JUNE 2, 1919.

'1 3%% 8 Patented June 8 1929.,

2 SHEE] S-SHEET I- WITNESSES INVENTOR Patenteol June 8,. 1920.

2 SHE ETSSHEET 2.

u o h Macnrnn B. HOLT, 01F DORMONT PENNSYLVANIA, AS$IGNOB T0 ROSEDALEFOUNDRY &

COMPANY, @F PITTSBURGH, PENNSYLVANIA, {A COORATION 0F PENN- FUENACECONSTRUCTION eashes.

Specification of Letters Batent.

Patented lune a, 1920)..

' Application filed .l'une a. ram. Serial in. court.

'To all whom it may concern:

Be it blown that l, l-lAiuus' B. How, 'residing at Dormont, in thecounty of Adle gheny and State of Pennsylvania, a -cit1zen of the UnitedStates, have invented or discovered certain new and useful Improvementsin Furnace Constructions, of which improvements the following is aspecification.

invention relates to boiler furnaces of the general type wherein fuel isprogressively fed fromthe front to the discharge side of a grate andwherein the ashes and clinkers are-pushed from the discharge side of thegrate upon a support from which they are "intermittently dumped into anash pit below the grate. v

In the operation of suchfurnaces considerable difliculty has beenexperienced largely the falling body of ashes frequently causes aportion of. the fire bed to slip and fall intothe ash pit. Not only doessuch d18- turbance of the fire. bed interfere with the smooth running'ofthefurnace, but the fire intheash pit seriously damages thelowerportion of the furnace structure; o Furthermore,,the hot burning clnkers resting upon the ash support, which is uncooled by airpassing-"through it, rapidly burnout the support, and such burn ng ishastened bythe heated ashes and clinkers in the ash pit, particularlywhen a portion of the fire bed slips" or is carried into the ash pit inthe manner just explained.

The object of my invention is to provide, for furnaces of the typedescribed, means of a practical character for overcoming the abovementioned difiiculties in furnace'operation.

My invention is illustrated in the accompanying sheets of drawings inwhich Figure 1 is avertical sectional view of a furnace, and'Figfi, aplan view of the ash support and mechanism for moving it, the plane ofview being indicated by the line Ill-ill, Fig. 7'

The invention is applicable to various forms of furnaces of the generaltype explained above. The furnace, which, for the purposes ofillustrating the invention, is shown in the drawings, is a forced draftfurnace having an inclinedgrate, the front upper portion 1 of which isstationary, and the lower rear portion 2 adapted toreciprocate.horizontally.- Coal placed in -a' hop.-

--per 3 is intermittently discharged'into the furnace upon the forwardgrate 1 by means of plungers l, each of which is connected by a linkfito a crank arm 6, whicharm is secured to a shaft 7 provided with a wormwheel 8. The worm wheel 8 is continuously.

driven by means of a rotating shaft 9 adapted to drive a. worm 10securedto a shaft 11, which shaft in turn is provided with a worm shaft 12meshing with the worm wheel 8. It will be understood that the shaft 9extends along the front of the furnace and that a plurality of drivingconnections extend from it to a plurality of plungers t for feeding fuelto the furnace. The reciprocation of the grate bars 2 is efiected incoiirdination with that, of the plungers. fl,

and to such end the grate bars are by means of rods 13 and links i l, 15and 16 connected to the plungers. As indicated, thegrates 1 and 2 areprovided with suitable'twyers 17 and 18 which communicate with theunderside of the grate,..which, in any desired manner, may be suppliedwith air under the required pressure for effecting 'a forced draft.

ln the practice of my invention l provide at the rear of the grate ahorizontally mow able ash-receiving and supporting basin constructed tocontinuously contain water in free communication with the ashes andclinkers thereon; Means are provided whereby water may be continuouslysupplied in variable quantities to the basin, and also means areprovided for moving the basin horizontally so as to permit the ashessupported thereby to fall into the ash pit 2@ below the basin withoutdumping or otherwise removing thevvater' from the basin.

' As shown in Fig. l, the basin is preferably constructed of an upperwall 21 and a lower wall 22, in the space between which walls water issupplied by means of a conduit 23 provided with a valve 24. To perinitthe basin to move horizontally a portion of the conduit E3 may be formedof flexible lllll ing tubing as shown in the drawings. The upper wall 21of the basin is provided with perforations 25 through which water mayflow to the upper face of such wall, and such face is perferablyprovided with a plurality of ribs 26 spaced sufiiciently close to eachother to prevent relatively large burn- CIinkers from being immediatelyquenched by dropping intothe water in the top of the basin. The basinmay be mount ed upon a truck 27 supported by tracks 28,

between which there is arranged a motive I fluid cylinder 29 forreciprocating the basin.

flow to and from the cylinder 29, such flow being. controlled by meansof a valve 35.

The ash-supporting basin, rather than being placed immediately at therear or diecharge end of the grate, preferably forms the bottom of anash depository, one vertical wall of which may be formed by the furnacewall 36 and the other by an apron 37 extending downwardly from the rearend of the grate. By providing a relatively large depository for ashes,the ashes need be dumped less frequently, which is of considerableadvantage in the operation of forced draft furnaces in which it isnecessary to shut 0d the draft during each ash-dumping operation.

in operation, fuel is progressively fed from the front to the rear ofthe furnace by means of the reciprocation of the plungers 4 andgratebars 2.. At the rear edge of the grate bars 2 the hot'ashes and clinkersfall into the ash depository andupo n the basin. The heat of such ashesandclinlrers, as well as theheat of the furnace, vaporizes the watersupplied to the basin in free communication with the ashes, and" thesteam thus formed flows upwardly and disintegrates the clinkers so thatthe ashes dump freely at each dumping operation. When suflicient asheshave accumulated to make it desirable to dump them into the ash pit,motive fluid ,is supplied through the pipe 34 to the cylinder' 29 withthe result that the basin moves horizontally immediately beneath thelower edge of the apron 37, the apron serving as a pusher to remove theashes from the top of the basin, the water, however, remaining in thebasin. If desired, the basin may be thus moved through only a portion ofits maximum extent of travel, or in other words only a portion of thebottom of the ash depository may be removed. As soon as the ashes havebeen dumped to the extent desired, the pipe 34 may be opened to exhaustand motive fluid supplied through the pipe does not burn out oroperation, suflicient water; may be supplied' to thebasinto cause thebasin to overflow into the ash pit and extinguish the fire before theheat thereof damages the lower portion of the furnace structure. It willbe observed that at all times the water supplied to the basin cools thebasin so that it become warped by the heat of the furnace.

According to the provisions of the patent statute, I have described theprinciple and operation of my invention together with the constructionwhich I-now consider to represent the best embodiment thereof. However,I desire to have it understood that within the scope of the appended,claims my I claim as my invention: A 1. in a boiler furnace, thecombination of a grate, means for progressively feeding fuel from thefront to the dischargeside invention may be practised by other terms ofconstruction than that specifically shown and described.

thereof, a horizontally'movable' ash receivq per edge of said basin, andmeans formoving said basin horizontally beneath said abutment to causethe ashes supported by thebasin to fall into said pit without removingthe water from the basin.

2. In a boiler furnace, the combination of a grate, means forprogressively feeding fuel from the front to the discharge side thereof,an ash'depository at the discharge side of the grate having one of itsside walls formed of an apron extending downwardly from the rear of thegrate, an ash-receiving and supporting basin forming the bottom of saiddepository and horizontally movable immediately beneath the lower edgeof said,

apron, means for supplying water to said basin in free communicationwith the ashes supported thereby, an ash pit below said basin, and meansfor moving said basin beneath said apron to cause ashes supported by thebasin to fall into said pit.

3. In a boiler furnace, the combination of a grate, means forprogressively feeding a fuel from the front to the discharge sidethereof, an ash-receiving and supporting basin at the discharge side ofthe grate constructed of a lower imperforate and an upper perforatewall, an ash pit below said basin, means for supplying water to thespace between the walls of said basin, an abutment adjacent to an upperedge of said basin, and means for moving said basin aeeaeoe m beneathsaid abutment to cause the ashes supported by the basin to fall intosaid pit.

at. In a boiler furnace, the combination of a forced draft grate, meansfor progresa sively feeding fuel from the front to the discharge sidethereof, an ash depository at the discharge side of the grate, thebottom of said depository being formed of a horizontally movable basin,means for supplying to water to said basin in free communication withthe ashes supported thereby, an ash pit below said basin, an abutmentadjacent to an upper edge of said basin, and means for moving said basinhorizontally beneath it ,said abutment to cause the ashes supported bythe basin to fall into said pit.

5. In a boiler furnace, the combination of a grate, means forprogressively feeding fuel from the front to the discharge side go"thereof, an ash depository at the discharge side of the grate having oneof its side walls formed of an apron extending downwardly from the rearof the grate, an ash-receiving and supporting basin formin the bottom ofsaid depository, said basin %eing mount ed on a truck and having itsupper face immediately below the lower edge of said apron, means forsupplying water to said basin in free communication with the ashessupported thereby, and means for moving said truck horizontally beneathsaid apron to cause the ashes supported by the basin to fall into saidpit.

6.. In a boiler furnace, the combination of a grate, means forprogressively feeding fuel. from the front to the discharge sidethereof, a movable ash-receiving and supporting shallow basin at thedischarge side of the grate, the upper face of said basin being providedwith clinker supporting ribs, means for supplying water to said basin infree communication with the ashes supported thereby, an ash pit belowsaid basin, and means for moving said basin to permit'the ashessupported thereby to fall into said pit. in testimony whereof I havehereunto set my hand.

HARRIS B. HOLT.

' Witness:

FRANCIS J. ToMAssoN.

